We will be a family of 4 adults and 5 children ages 2-11 staying in Ennis and wanting to travel to Dublin. We thought if we got to Limerick we could take a train to Dublin and stay overnight and return the next day. Kindly advise if this is doable or whatever.
Look at the official Irish railway website for train times, details and fares:
You don't need to go to Limerick unless you really want to. You can easily travel by train from Ennis to Dublin, with one change at Athenry. Journey time is from just under 3 hours so, obviously, planning an overnight stay is sensible.
Trains from Limerick to Dublin do not generally involve a change so the journey time is a little less...but you'll still have the cost and hassle of either riving and parking or taking the bus to Limerick.
Changing trains is very easy and you can be reassured that, by default, plenty of time is allowed to do so.
Look at www.booking.com for Dublin accommodation. It is a reliable and long-established site, with extensive listings and trustworthy guest reviews which can only be posted by those who have booked through the site and completed their stay.
Mentioned in this answer: